Dell PowerEdge 6650

SCSI/RAID

SCSI Drive Backplane

The PowerEdge 6650 backplane is differentiated from other PowerEdge backplanes by its SCSI routing methods and termination. Because the PowerEdge 6650 has limited component space, the backplane consists of a mainboard and a daughter board.

This is a picture of the SCSI backplane

IMPORTANT - More Information NOTE: There are 2 channels on the backplane, which allows splitting. If the integrated 7892 SCSI adapter is used for hard drives, the cable must be attached to channel A. If it is attached to channel B, the system will not see the hard drives.

This is a picture of the SCSI assembly, removed from the system, with Channels A and B highlighted

Backplane Mainboard
Key features of the PowerEdge 6550 backplane mainboard include:

Support for Ultra-3 SCSI (Fast-80), Ultra160 subset and U320
Five (5) SCA-2 slot connectors with support for 1" hot-plug hard drives
One (1) 18-pin power connector providing 3.3V, 5V, & 12V power, IPMB, and PWRGOOD
Two 68-pin SCSI connectors for connecting LVD SCSI controllers to the backplane
Support in design of controlling up to 5 slots, and single or split (2+3) SCSI bus operation
- 2+3 means that in split mode, 2 drives (ID 0 & 1) sit on one SCSI bus while 3 drives (ID 2, 3, & 4) sit on the other SCSI bus
Temperature/voltage monitoring via LM75 and LM81
Dual I2C buses
256 byte EEPROM designated for FRU (Field Replaceable Unit) information

This is a picture of the SCSI assembly

Daughter Board

Key features of the PowerEdge 6650 backplane daughter board include:

Two QLogic GEM359 integrated microcontrollers and SCSI target chip operating at up to 20 MHz
64KB Flash memory (using 8Mbit Flash) per GEM359
LVD-only termination for each SCSI bus

This is a picture of the SCSI assembly